Recognition: unknown
LFV decays in a 3-4-1 model with minimal inverse seesaw neutrinos
Pith reviewed 2026-05-10 17:11 UTC · model grok-4.3
The pith
A 3-4-1 model with minimal inverse seesaw neutrinos generates strong correlations between the electron and muon g-2 anomalies and lepton flavor violating decay rates.
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
Core claim
The model predicts strong correlations among the (g-2)e,μ anomalies and the LFV decay rates of charged leptons, the SM-like Higgs, and the Z boson. The current upper bound on Br(τ → μγ) imposes a stringent constraint compatible with the 1σ experimental range of (g-2)μ, corresponding to a maximal deviation of 10^{-9} from the SM prediction. The forthcoming experimental sensitivity to Br(τ → μγ) will reduce this deviation to 5×10^{-10}.
What carries the argument
The 3-4-1 gauge symmetry extended by a minimal inverse seesaw neutrino sector and a new singly charged Higgs boson, whose Yukawa couplings and mass parameters generate the correlations between the magnetic moment anomalies and the flavor-violating processes.
If this is right
- The existing upper limit on Br(τ → μγ) caps the maximum allowed deviation in (g-2)μ at 10^{-9}.
- Improved sensitivity to Br(τ → μγ) will further restrict the possible (g-2)μ shift to 5×10^{-10}.
- The same parameter choices that fit the g-2 anomalies also determine the rates for LFV decays of the Higgs and Z bosons.
- All current experimental data on these observables can be accommodated simultaneously within the model.
Where Pith is reading between the lines
- Independent searches for the new singly charged Higgs at colliders could test the same parameter region that controls the g-2 and LFV correlations.
- The required neutrino mass matrices may imply specific patterns in oscillation data or neutrinoless double-beta decay rates.
- If the g-2 anomalies are confirmed at the predicted level, the model would forecast measurable LFV signals at next-generation flavor experiments.
Load-bearing premise
The Yukawa couplings and mass parameters in the minimal inverse seesaw sector can be adjusted to fit the g-2 anomalies while keeping all lepton flavor violating rates below current experimental limits and consistent with observed neutrino masses.
What would settle it
A future measurement showing Br(τ → μγ) below the current bound together with a (g-2)μ deviation larger than 10^{-9} from the Standard Model value would contradict the correlations required by the model.
Figures
read the original abstract
We investigate an extended 3-4-1 model consisting of a new singly charged Higgs boson, implementing the minimal inverse seesaw mechanism to accommodate the large values of the $(g-2)_{e,\mu}$ anomalies as well as the lepton-flavor-violating decay rates of charged leptons, the Standard Model-like Higgs boson, and the $Z$ boson, all consistent with current experimental data. Unlike the previously studied 3-4-1 realization, the model considered here predicts strong correlations among these observables that can be tested in future experiments. In particular, the current upper bound on Br$(\tau \to \mu \gamma)$ imposes a stringent constraint compatible with the $1\sigma$ experimental range of $(g-2)_{\mu}$, corresponding to a maximal deviation of $10^{-9}$ from the SM prediction. The forthcoming experimental sensitivity to Br$(\tau \to \mu\gamma)$ will reduce this deviation to $5\times 10^{-10}$.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The manuscript presents a 3-4-1 gauge extension with a singly charged Higgs boson and minimal inverse seesaw neutrinos. It derives one-loop contributions to the (g-2)e,μ anomalies and to LFV processes (τ→μγ, h→τμ, Z→τμ), then performs a numerical scan over the allowed parameter space subject to neutrino oscillation data and collider bounds. The central result is a set of strong correlations among these observables, with the current experimental upper limit on Br(τ→μγ) restricting the maximal (g-2)μ deviation to 10^{-9} within the 1σ experimental range, and future sensitivity tightening this to 5×10^{-10}.
Significance. If the numerical results hold, the work supplies concrete, falsifiable correlations between the (g-2) anomalies and LFV branching ratios that can be tested at Belle II and future colliders, distinguishing this 3-4-1 realization from earlier variants. Credit is due for the explicit one-loop expressions, the imposition of neutrino-mass and collider constraints, and the quantitative mapping of the allowed region in observable space.
minor comments (2)
- [Section 3] Section 3 (or wherever the inverse-seesaw Yukawa matrices are introduced): explicit matrix forms for the Yukawa couplings and the small lepton-number-violating parameter would improve reproducibility of the loop integrals and mixing angles.
- [Numerical results] Numerical scan subsection: the ranges, priors, and sampling method for the free parameters (Yukawas, new Higgs and neutrino masses) should be stated more precisely so that the reported maximal deviations and correlation bands can be independently verified.
Simulated Author's Rebuttal
We thank the referee for the positive assessment of our manuscript on LFV decays in the 3-4-1 model with minimal inverse seesaw neutrinos and for recommending minor revision. The referee summary correctly reflects the central predictions of strong correlations between the (g-2) anomalies and LFV rates, with the τ→μγ bound limiting the muon anomaly. No major comments were provided in the report.
Circularity Check
No significant circularity; derivation is self-contained
full rationale
The paper constructs a 3-4-1 gauge model with minimal inverse seesaw, derives one-loop contributions to (g-2)e,μ and LFV processes from explicit Feynman diagrams and mixing matrices, then performs a numerical scan over Yukawa couplings and mass parameters subject to neutrino oscillation data and collider bounds. The reported correlations and maximal (g-2)μ deviation under the Br(τ→μγ) limit emerge directly from evaluating the loop functions over the allowed parameter region; no step reduces by definition or self-citation to the target observables themselves. The central claim is therefore a genuine model prediction rather than a re-expression of fitted inputs.
Axiom & Free-Parameter Ledger
free parameters (2)
- Yukawa couplings in inverse seesaw
- Masses of new Higgs and neutrinos
axioms (2)
- domain assumption The 3-4-1 gauge symmetry and particle content
- domain assumption Minimal inverse seesaw mechanism generates small neutrino masses
invented entities (1)
-
Singly charged Higgs boson
no independent evidence
Reference graph
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discussion (0)
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